Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b58dfbfb799907…

MALICIOUS

PDF

38.1 KB Created: 2020-07-30 17:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a69c3a033b06fa5bef39b5cb35fbf18f SHA-1: ecb8ab4c53b6b3a778100e10b4692b45484553f8 SHA-256: 54b58dfbfb799907bd0fc1b7741c5f75f22bbe2013aac8d92a3b3bfa3bf17c28
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links, characteristic of a link farm or SEO abuse. One of these links, https://ttraff.ru/pify?keyword=codex+chaos+knights+pdf+espa%25C3%25B1ol, points to known malicious redirector infrastructure. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it may be part of a larger malicious operation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=codex+chaos+knights+pdf+espa%25C3%25B1ol
    • http://files.ejpalmieri.com/uploads/1/3/2/6/132681556/jodakenotog.pdf
    • http://files.thejanusensemble.com/uploads/1/3/1/3/131398278/bugeripagu.pdf
    • http://files.usapl-ct.com/uploads/1/3/1/8/131856276/3580882.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/39721814967.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/bukepavas.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/siwogijaxenokezasajis.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/87876879130.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/40055976188.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/146337134.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4107173541.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/winevofuwunab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/7077036909.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/xebabes.pdf
    • https://cdn.shopify.com/s/files/1/0430/1497/9737/files/22441950833.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3090/files/fasab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005300.bin
55e21e8344ba8f5ca62924a33d8b8f39b7b2445cc0018c6526754e3ff1898345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5300 5476 bytes
font_01_sfnt_off0000655d.bin
788531753c02529b3204c725623afcf18948ba9421d0847ff6923e9d2cda7be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655D 10600 bytes

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